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Patella infera
2%
63/3456
Decreased patellar mobility
1%
51/3456
Loss of active but not passive flexion
66%
2275/3456
Loss of full extension
16%
556/3456
Loss of passive flexion
14%
497/3456
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All of the listed responses are consistent with infrapatellar contracture syndrome EXCEPT for Answer #3 which is incorrect because the resulting stiffness affects both active and passive motion. This is an uncommon complication following knee surgery or injury which results in knee stiffness. The resulting stiffness limits both active and passive range of motion (ROM) and usually results in loss of flexion, extension, and patellar mobility. The development of patella infera (baja) on lateral radiographs is a common sequela and also a poor prognostic sign. Paulos et al. describe the risk factors and their results of treatment. ACL surgery is a risk factor, as is the use of a patellar tendon autograft, multiple knee surgeries, and non-isometric tunnel placement. In patients with this condition, the use of closed manipulation and the development of patella infera are negative prognostic factors. Surgical releases are recommended to improve motion, but residual functional impairment and only fair subjective scores should be expected.
1.8
(82)
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